Agree with you everything that you have said here.These people know how to do their individual disciplines because they have a depth of knowledge in applying them.
Boxers don't just know how to punch.
Boxers know how to manage distance, and move, how to bait people, how to move their heads and so on.
And because they know that they punch more effectively than someone who knows how to punch.
What's your definition of "1/2 MA"?